National Dental Examining Board of Canada (NDEB) Practice Exam 2026 - Free NDEB Practice Questions and Study Guide

Myxedema is a condition that occurs when there is insufficient thyroid hormone production in the body. This causes a slowdown in the body's metabolism, leading to symptoms such as weight gain, fatigue, and cold intolerance.

Option B (excess parathyroid hormone) is incorrect because parathyroid hormone is responsible for regulating calcium levels in the body, not thyroid function.

Option C (insufficient insulin) is incorrect because insulin is a hormone related to blood sugar regulation, not thyroid function.

Option D (excess cortisol) is incorrect because cortisol is a stress hormone that is not directly involved in thyroid function. Therefore, the correct answer is option A.